Heat recovery air exchanger



FIG. 1 is a front perspective view of the heat recovery air exchanger;

FIG. 2 is a front view of the heat recovery air exchanger;

FIG. 3 is a right side view of the heat recovery air exchanger; and,

FIG. 4 is a top view of the heat recovery air exchanger.

In the drawings, the broken lines depict unclaimed subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a heat recovery air exchanger, as shown and described. 